Replace deprecated github.com/golang/protobuf

[mjholub]

I have also bumped Go version to 1.18, although many distros stopped providing updates to this version already and thus 1.19 would be even more preferred for a security program. I have also updated other dependencies and provided json tags for structs.

[ple1n]

@gustavo-iniguez-goya is there anything wrong with this PR.